>Thanks, I had not got that PA itself had been ported to all these platforms. That seems to change everything.
Not so much - because it's only technically true (in other words, it's lies). A couple of years ago they managed to build it on a selection of platforms so they could claim 'portability' as a ticklist item.
Try building PulseAudio for Windows. When you've given up, try installing the binary package that is usually mentioned whenever this discussion comes up - it's two years old and I couldn't get it to work *at all* with a few hours' hair-pulling.
I don't know where the OS X idea came from - PA doesn't even *claim* to work there, and according to the PA website, the last time it was tested on anything other than Linux was 2007.